Grinding machine



A118'- v 6, 1935. B. A. KEARNs 2,010,366

GRINDING MACHINE Filed Jan. 2s, 1930 mated Aug. 6, 1935 I 2,010,366

UNITED STATES PATENT OFFICE GRINDING MACHINE Bernard A. Kearns,Cincinnati, Ohio, assignor to Cincinnati Grinders Incorporated,Cincinnati, Ohio, a corporation of Ohio Application January 2s, i930,serial No. 424,075 s claims. (ciu- 21) 'I'his invention relates toimprovements in inaing I9 is mounted in a counterbore formed in chinetools and especially to improvements in the bed I and surrounds theshaft to reduce means for effecting the drive of a reciprocable thefriction on the shaft during operation. Surmember thereof. rounding thebearing I1 interiorly of the bed is 5 An object of the invention is theprovision of a bevel gear 20 meshing with a bevel pinion 2| on 5improved means for driving the reciprocable the end of a shaft 22. Shaft22 is journaled at member or table of a machine tool such as the one endin a suitable bearing 23 carried by the Work carrying table of agrinding machine. bed I0. The other end of the shaft extends Anotherobject of the invention is the provithrough a bearing 24 of housing 25and is prosion of improved means operative upon reversal vided on thisend with a. pinion 2B coupled l0 of the work carrying table or the likeof a mathrough silent chain 21 with a driving pinion 28 chine tool tocushion the shock incident to reformed on the end of hub 29 in drivingconnecversal so that it is not transmitted to the parts. tion with handwheel 30. To complete the Another and specific object of the inventionmanual drive from the hand wheel 30 to the is the provision of acushioning clutch member pinion I5 a clutch member 3| is provided being15 or the like effective upon reversal of a reciprosplined or otherwiseslidably secured to the shaft lcable member such as the work supportingtable I6 so as to move therewith during rotation but of a grindingmachine so that no shock due to be independently slidably actuatedrelative therethe metal to metal driving connection results to. Clutch3| is provided with clutchteeth 32 from said reversal and to permit aslight tarry on one end adapted to mesh with clutch teeth 33 20 in themovement of the table before reversal. l formed on the hub 34 of bevelgear 20. A ro- Other objects and advantages of the present tatable shiftrod 35 journaled at one end in invention should be readily apparent byreferbearing 36 and at the other end in housing 25 ence to the followingspecification considered in is provided with a socket member 31 on itsforconjunction withy lthe accompanying drawing ward end receiving theball end of shift lever 38 25 forming a part thereof anditl isto beunderstood for shifting the rod 35 to cause engagement bethat anymodifications may be .made in thespetween the clutch teeth 32 and 33.Reverse actuacic structural details hereinafter disclosed tion of lever38 causes an engagement between within the scope of the appended claims,withclutch teeth 39 formed on the other end of clutch out departing fromor exceeding the spirit of spool 3| with the clutch teeth 40 formed onthe 30 the invention. 1 end of one member of the drive clutch 4I toFigure 1 is a fragmentary' transverse sectional power actuate the tableI3. view through a'machine tool such as a grinding From the foregoing itwillv be noted that the machine embodying the improvements of this worksupporting table may be manually actuated invention. through the handwheel 30 to manually recipro- 35 Figure 2 is a sectional view taken online 2-2 cate the table I3 while to power actuate the same 0f Figure 1.the following mechanism is employed. Prime Figure 3 is a sectional viewtaken on line 3-3 mover 42 is coupled through silent chain 43 to ofFigure 2. drive the shaft of bevel gear 44 Journaled in a 40 Figure 4 isa sectional view taken on line 4--4 bearing 45 integral with the bed IQ.Meshing 40 of Figure 2. with the drive gear 44 on opposite sides thereofThroughout the several views of the drawing is a pair of reversing bevelpnions 46 and 41 similar reference characters are utilized to delooselymounted on the drive shaft 48.V Gears 46 and 41 are respectivelyprovided with clutch faces note same or similar parts. Q A deviceembodying this invention may com 43 and 50 adapted to respectivelyengage `with 45 52 of double end clutch spool prise a bed or support I0having formed on the clutch faces 5I and l upper surface thereof ways IIand I2 for guid- 53. A shifter fork 54 is provided engagingin a ing awork supporting table `or the like I3 longigroove formed in the clutchspool 53 and having tudinally of the bed I0. The table I3 has secured astud 55 received in one end of link 5 6. l ,The 50 to its under surfacea rack I4 extending substanother end of the link 5E issecured to stub`shaft tially throughout the length thereof and in mesh 51 extendingfrom reverse lever 58 for shifting with a driving pinion I5 secured tothe end .of the clutch in opposite directions to, engageeither pinion ordriven shaft I6. Shaft I6 is journaled Yof driven rp inions 4,6. andjl.rlhe `reversmg in a bearing I1 carried by a depending lug I3 mechanismJust dessi-ib dus adapted to .rotate 55 integral with the bed I0. Ananti-friction bearworm 53 formed integral with drive shaft 48 in 55either a clockwise or counterclockwise direction for correspondinglydriving clutch 4l and shaft I6. Driving clutch 4l comprises cup. shapedvmember 60 having integral therewith worm gear 6| and a depending hub 62rotatably journaled in bearing 63 formed integral with the bed l0. Aclosure plate 64 is secured to the upper end of cup member 60 and hasdepending interiorly thereof driving lugs 65 and 66. The lugs 65 and 66are diametrically opposite one another and are adapted to engage lugs 61and 68 integral with the driven member 69 to establish a positivedriving connection between the drive and driven shafts. The drivenmember 69 is provided on its upper end with clutch teeth 40 abovedescribed. By this construction chambers 10 and 1l are formed betweenopposed face of the driven lugs 61 and 68 in which a suitable cushioningmedium such as oil is enclosed and through which chambers driving lugs65 and 66 respectively travel. To avoid shock to the parts caused by thereverse rotation of clutch 4| and to effect a slight tarry of the worksupporting table followed by a gradually accelerated speed thereof, thedriving lugs 65 and 66 are each provided with a pair of valve chambers12 and 13 receiving valves 15 and 19 respectively. A port 16 connectsvalve chamber 12 with inlet port 11 extending to one side of the lug 65into oil chamber 10a of chamber 10 on one side of lug 65. A second ordischarge port 18 connects valve chamber 12 with the oil chamber 10b ofchamber 1ll on the other side of chamber 10 and the ow therethrough iscontrolled by the valve 15. Valve chamber 13 is likewise provided with aport 80 connecting same through inlet port 8l with oil chamber 10b. A'second or discharge port 82 connects the valve chamber 13 with the oilchamber 10a and the ow therethrough is controlled by valve 19. Each ofthe valves 15 and 19 has mounted above it a spring `83 abutting on itsupperend with an adjusting nut 84 to vary the tension thereof.

The operation of this hydraulic tarry clutch is as follows: Assuming inconnection with Figure 2 that the driving lugs 65 and 66 were rotatingin a counter clockwise direction to correspondingly rotate the drivenlugs 61 and 68 and that through the reversing mechanism the rotation oflugs 65 and 66 is reversed. The cushioning medium or oil in chamber 10is now between right hand face of lug 68 and the opposed face of lug 65and the medium in chamber 1| is between the left hand face of the lug 61and the opposed face of lug 66 all as seen in Figure 2. Upon reversalthe face of lugs 65 and 66 in contact with the medium would tend tocompress the same betweenV itself and the opposed face of lugs 61 and 68thereby creating a pressure on the medium. As this pressure builds up tothe point of overcoming the inertia of the parts the driven clutchmember commences to slowly rotate carrying with it the parts to bedriven thereby. At the same time the medium is forced under the pressureinto inlet port 11 which pressure builds up to the point of overcomingthe tension of springs 83 to raise valves 15 to open discharge ports 18and permit an escape of the medium from one side of the driving lug tothe other. The size of the ports 16, 11 and 18 is such that escape ofthe medium from one side of the driving lug to the other is slower thanthe rate of building up of pressure metal driving connection is therebyestablished without any clashing of the parts and no resultant shock tothe machine.

The tensioning nut 84 may be adjusted to increase or decrease thepressure necessary to raise the valves 15 and 19 to thereby adjust thetime of tarry and effective operation of the clutch.

From the foregoing description it will be noted that an improved drivefor a reciprocating member of a machine tool has been provided and thatthe said drive may be accomplished either by manual or power means. Alsowhen the power means is employed improved mechanism is provided to takeup the shock due to reversal of the parts and to permit a slight tarryor pause in the movement of reciprocating member followed by a gradualspeeding up thereof until the proper desired speed is attained.

What is claimed is:

1. A mechanism for cushioning the shock incident of reversing atranslatable member of a machine tool organization which includes atransmission line for effecting the .translation of the member and meansfor reversing the direction of drive of the transmission line, incombination, an hydraulic tarry and transmission clutch comprising adriving member, a driven member, means carried by each member forengagement one with the other to establish a positive drive therebetweenand means yieldably cushioning the engagement of the driving means,including an enclosed chamber containing the said driving means, anhydraulic medium within the chamber betwen the driving means, andadditional means carried by the driving means permitting the passage ofthe medium therethrough from between the driving means to beyond thesaid driving means.

2. A mechanism for cushioning the shock incident to reversing atranslatable member of a machine tool organization, which includes atransmission line having a driving shaft, a driven shaft and means forreversing the driving impulse of the driving shaft, in combination,means between the driving and driven shafts absorbing the shock incidentto said reversal and for effecting and adjustably determining theduration of a pause in the movement of the translatable member uponreversal comprising a cup shaped member having driving lugs associatedtherewith and having a cap plate closing the cup to form a chamberinteriorly thereof, a driven member having lugs for engagement with thelugs of the driving member, a non-compressable medium between thedriving and driven lugs, certain of the lugs having passages formedtherein to permit the flow of the medium therethrough, means controllingthe ow of the medium through the passages comprising a valve, andyielding means yieldingly limiting movement of the valve.

3. In a reversible power transmission drive the combination with adriving and a driven shaft, of a clutch therebetween for absorbing theshock incident to the reversal, for effecting a tarry prior to reversaland for establishing a diving connection between the driving and drivenshafts upon reversal including a cup shaped member, a closure plate forthe member forming a sealed chamber interiorly thereof, a driven membercarried by the driven shaft and mounted centrally of the driving member,a lug extending from the driven member into the chamber, a lug extendingfrom the driving member into the chamber, and a non-compressible uidwithin the chamber intermediate the lugs, one of the lugs having apasversible impositiva drive couplable with the shaft sage therethroughto permit the escape of the fluid from one end of the chamber to theother as the lugs are brought toward one another iorV eifecting adriving connection therebetween.

4. In a. reversible power transmission drive the combination with adriving and a driven shaft,

of a clutch therebetween for absorbing the shock incident to thereversal, for effecting a tarry-I driven member into thechamber, a lugextending from the driving member into the chamber, a non-compressibleuid within the chamber intermediate the lugs, one of the lugs having apas.- sage therethrough to permit the escape of the fluid from one endof the chamber to the other as the lugs are brought toward one anotherfor eifecting a driving connection therebetween, and means in thepassage regulating the rate of flow of the fluid therethrough andthereby controlling the cushioning effect thereof, the amount of tarryand rate of acceleration of the parts upon reversal.

5. In a reversible power transmission drive the combination with adriving and a driven shaft, of a clutch -therebetween for absorbing theshock incident to the reversal, for effecting a tarry prior to reversaland for establishing a driving connection between the driving and drivenshafts upon reversal including a cup` shaped member, a

- closure plate for the member forming a sealed chamber interiorlythereof, a driven member carried by the driven shaft and mountedcentrally of the driving member, a lug extending from the driven memberinto the chamber, a lug extending from the driving member into thechamber, a non-compressible fluid within the chamber'intermediate thelugs, one of the lugs having a passage therethrough to permit the escapeof the fluid from one end of the chamber to the other as the lugs arebrought toward one another for e'ecting a driving connectiontherebetween, means in the passage regulating the rate of flow of thefluid therethrough and thereby controlling the-cushioning effectthereof, the amount of tarry and rate of acceleration of the parts uponreversal, said means comprising a valve, aA spring engaging the valveand yieldingly resisting move* ment thereof, and an adjusting screw forchanging the yielding resistance of the spring.

6. A machine tool organization which includes a reciprocable member anda shaft for' actuating said member, in combination a positive drivecouplable with said shaft for operating same, a refor actuating same,means connectingeither the ioning the shock incident to reversal, saidclutch including a pair of clutch members circumscribing said shaft andarranged in telescopingvrelation and each member having a driving lugadapted to contact with one another, a sealed chamber formed by theclutch members in which are positioned the driving lugs, and anhydraulic medium in the chamber between the non-contacting sides of thedriving lugs adapted to escape through and beyond one of the lugs asthey are brought toward one another upon reversal.

7. A mechanism for cushioning the shock incident to reversing 'atranslatable member of a machine tool organization which includes atransmission line having a driving shaft, a driven shaft and means forreversing the driving impulse of the driving shaft, in combination,positive clutch means between the driving and driven shafts fortransmitting the reverse driving impulse from the driving shaft to thedriven shaft and consequently to the translatable member, and adjustablemeans associated with the clutch means for varying the time intervalbetween the reversing of the driving impulse to the driving shaft andthe engagement of the positive clutch means.

8. A mechanism for cushioning the shock incident to reversing atranslatablemember of a machine tool organization which includes atransmission line having a driving shaft, a driven shaft and means forreversing the driving impulse of the driving shaft, in combination,positive clutch means between the dri-ving and driven shafts fortransmitting the reverse driving impulses from the driving shaft to thedriven shaft and consequently to the translatable member, and adjustablemeans associated with the clutch means for varying the time intervalbetween the reversing of the driving impulse to the driving shaft andthe engagement of the positive clutch means, said clutch meanscomprising a cup-shaped member having driving lugs associated therewithand secured to one of the shafts, a cap plate closing the cup andforming a chamber interiorly thereof, and a driven member having lugsfor engagement with the lugsV of the driving member and secured to theother shaft, the lugs of either the driving or the driven member havingports therethrough, and the tarry means including a non-compressiblefluid within the cup chamber adapted to be forced through the ports inthe lug, and valve means controlling the flow through said ports.

BERNARD A. KEARNS.

